What is the number of cells in series for the battery? If it's Li ion (except LiFeSO4, AIR), 14s is 58.8V (4.2 X 14). The LVC (low voltage cut-off) possibly shut the battery down in order to protect it. Beware, running a battery too close to "exhausted" isn't good for the battery and could be dangerous. At 18 or so mph (no wind, flat terrain, normal load, throttle only), you should get 40 - 45 miles. Any deviation in either direction (hill, decrease; pedal, increase) will influence this number. JMO!